View, group & share contacts - Computer - Contacts Help
https://support.google.com/contacts/answer/30970?co=GENIE.Platform%3DDesktop&hl=en
Note: If you use Gmail for work or school and someone gives you access to their Gmail, you can manage labels on their contacts, too. Open Gmail.; At the top left, click Compose.; Click To, Cc, or Bcc.; Find a contact, then check the box next to their name. Click Manage labels.; Change or add group labels: To add the contact to a group label, click the group label, then click Apply.
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